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During vacuuming, the motor insulation must not be measured to avoid serious
damage to the motor coil.
warn：
Start vacuuming and do not measure insulation until refrigerant vacuuming is
complete.
After the new machine is filled with refrigerant, the insulation value should be at least
5MQ or more, otherwise it should be confirmed whether there is a vacuum. Measure the
insulation of the motor temperature protection contact with a voltage multimeter below
DC9V, do not use a megohmmeter.
run check
1) Jog the compressor (about 0,5-1 seconds) to determine the normal rotation of the
compressor by monitoring the suction and discharge pressure. (The way of determining the
normal rotation of the compressor: the suction pressure drops immediately, and the discharge
pressure rises at the same time.
2) After starting, check whether the lubricating oil in the sight glass on the external oil
circuit is full. If there is any problem, please check the system high and low pressure difference
(oil supply pressure difference), whether the filter is blocked (oil pressure difference alarm),
whether the external oil return solenoid valve is open, and check whether the oil outlet is
blocked.
3) When the compressor is started, the lubricating oil in the oil separator will foam for a
short time, but when the compressor works under the rated working conditions, the lubricating
oil foam will disappear. Under normal circumstances, the normal oil level in the oil fraction is
above the midline of the low-sleeve sight glass. Otherwise, it means that the system is
insufficiently refueled or the compressor runs out of oil.
4) The operating conditions of the compressor should be adjusted as follows: the exhaust
temperature should be higher than the condensing temperature by more than 30K, and the
suction superheat degree should be within 15K.
5) The entire equipment, especially the pipeline must be tested for abnormal vibration.
6) The compressor is running for a long time and needs to be checked daily: the operating
data of the machine (such as three-phase voltage, compressor line current, etc.), the oil
temperature and oil level of the lubricating oil, all the sensing parts of the compressor, Check
the connection of the wires and their tightness, and check the oil sight glass.
7) When the unit is running, special attention should be paid to its auxiliary equipment and
the maintenance cycle of the unit.
8) After the compressor is turned off, the oil heater on the external oil separator should be
kept on.
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